I'm guessing it was Samsung neutering the platform. They never have really given too much time to advertising the capabilities of the platform (for example, no displays in their stores demoing the "phone as a desktop" capability).
The Samsung DeX Station (https://www.samsung.com/au/galaxy-s8-accessories/dex-station...) is no longer manufactured which is a massive let down. It does however still work with the S10+, and I presume the S20. The ability send a network cable straight to the phone was pretty handy for a few situations.
My mom refuses to use dex, I found it to be great as a basic workstation. Definitely removes the need for eg a chrome book. Does not replace your power user machine however
https://www.samsung.com/us/explore/dex/
It's actually really good. I can wirelessly turn my TV into a 4K Android tablet, and with a Bluetooth keyboard and mouse, it turns into a computer.
Same with a USB cable plugged into my desk's monitor to HDMI. If I didn't require a computer for development, I would not buy computers any more.